135673666 has 4 divisors (see below), whose sum is σ = 203510502. Its totient is φ = 67836832.

The previous prime is 135673663. The next prime is 135673667. The reversal of 135673666 is 666376531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 666376531 = 19 ⋅35072449.

It can be written as a sum of positive squares in only one way, i.e., 98109025 + 37564641 = 9905^2 + 6129^2 .

It is not an unprimeable number, because it can be changed into a prime (135673663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33918415 + ... + 33918418.

Almost surely, 2^135673666 is an apocalyptic number.

135673666 is a deficient number, since it is larger than the sum of its proper divisors (67836836).

135673666 is an equidigital number, since it uses as much as digits as its factorization.

135673666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67836835.

The product of its digits is 408240, while the sum is 43.

The square root of 135673666 is about 11647.9039316093. The cubic root of 135673666 is about 513.8446668354.

The spelling of 135673666 in words is "one hundred thirty-five million, six hundred seventy-three thousand, six hundred sixty-six".